Can't say I notice a difference, most platforms just take your webcam data and forward it so I don't get why people report different qualities? Never had to use zoom luckily but between Wire, Jitsi, Hangouts, BigBlueButton, and two others whose names I don't remember right now, it always depended on people's mics, cams, and WiFis (and sometimes available CPU if my crappy work laptop had too much to do in the background to en/decrypt the streams).